客户端-架构相互作用抑制了客户端蛋白质在模型凝聚物中的聚合
Rashik Ahmed1,2,3,4, Rhea P Hudson4, Julie D Forman-Kay3,4
1Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8, Canada.
概括
细胞循环相关蛋白1 (CAPRIN1) 凝结物防止了化在肉瘤 (FUS) RNA识别因子 (RRM) 客户端的聚合. 卡普林1的相互作用屏蔽了FUS RRM,尽管度增加和展开,但抑制了聚合.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 细胞凝聚物中的蛋白质与蛋白质相互作用可以增加局部度,往往促进异常聚合.
- 然而,冷凝环境在保护客户端蛋白质免受聚合方面的作用不太清楚.
研究的目的:
- 调查细胞循环相关蛋白1 (CAPRIN1) 形成的凝结物如何影响其客户端的聚合,即在肉瘤 (FUS) 中融合的RNA识别因子 (RRM).
- 阐明 CAPRIN1 凝结物可能抑制 FUS RRM 聚合的分子机制.
主要方法:
- 核磁共振 (NMR) 谱学被用来比较溶液中的FUS RRM域与CAPRIN1凝聚剂中的FUS RRM域.
- 进行了对净化FUS RRM和FUS RRM:CAPRIN1凝聚物的NMR比较研究,包括分子间NOE实验.
主要成果:
- 卡普林1凝聚剂抑制了FUS RRM聚合,即使局部度增加了两倍,并且FUS RRM域显著展开.
- 发现CAPRIN1与展开的FUS RRM的多个区域相互作用,包括287IFVQ290和351IDWFDG356.6等特定序列.
- 这些CAPRIN1和FUS RRM之间的异型相互作用超过了推动聚合的FUS RRM原体之间的同型相互作用.
结论:
- 凝聚性支架分子,如CAPRIN1,可以通过屏蔽关键的原体间相互作用点来保护客户端蛋白质免受聚合.
- 这项研究提供了一个机制,在凝结环境中的特定分子相互作用可以防止异常蛋白质聚合,与常见的观察形成鲜明对比.
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